docs/versions/8.1.1/rules/lib/builtins/Label.mdx

---
title: 'Label'
---

A BUILD target identifier.

For every `Label` instance `l`, the string representation `str(l)` has the property that `Label(str(l)) == l`, regardless of where the `Label()` call occurs.

When passed as positional arguments to `print()` or `fail()`, `Label` use a string representation optimized for human readability instead. This representation uses an [apparent repository name](/versions/8.1.1/external/overview#apparent-repo-name) from the perspective of the main repository if possible.

## Members

* [Label](#Label)
* [name](#name)
* [package](#package)
* [relative](#relative)
* [repo\_name](#repo_name)
* [same\_package\_label](#same_package_label)
* [workspace\_name](#workspace_name)
* [workspace\_root](#workspace_root)

## Label

```
Label Label(input)
```

Converts a label string into a `Label` object, in the context of the package where the calling `.bzl` source file lives. If the given value is already a `Label`, it is returned unchanged.

For macros, a related function, `native.package_relative_label()`, converts the input into a `Label` in the context of the package currently being constructed. Use that function to mimic the string-to-label conversion that is automatically done by label-valued rule attributes.

### Parameters

| Parameter | Description |
| --- | --- |
| `input` | [string](../core/string); or [Label](../builtins/Label); required  The input label string or Label object. If a Label object is passed, it's returned as is. |

## name

```
string Label.name
```

The name of the target referred to by this label. For instance:

```
Label("@@foo//pkg/foo:abc").name == "abc"
```

## package

```
string Label.package
```

The name of the package containing the target referred to by this label, without the repository name. For instance:

```
Label("@@repo//pkg/foo:abc").package == "pkg/foo"
```

## relative

```
Label Label.relative(relName)
```

**Experimental**. This API is experimental and may change at any time. Please do not depend on it. It may be enabled on an experimental basis by setting `--+incompatible_enable_deprecated_label_apis`
**Deprecated.** This method behaves surprisingly when used with an argument containing an apparent repo name. Prefer [`Label.same_package_label()`](#same_package_label), [`native.package_relative_label()`](../toplevel/native#package_relative_label), or [`Label()`](#Label) instead.

Resolves a label that is either absolute (starts with `//`) or relative to the current package. If this label is in a remote repository, the argument will be resolved relative to that repository. If the argument contains a repository name, the current label is ignored and the argument is returned as-is, except that the repository name is rewritten if it is in the current repository mapping. Reserved labels will also be returned as-is.
For example:

```
Label("//foo/bar:baz").relative(":quux") == Label("//foo/bar:quux")
Label("//foo/bar:baz").relative("//wiz:quux") == Label("//wiz:quux")
Label("@repo//foo/bar:baz").relative("//wiz:quux") == Label("@repo//wiz:quux")
Label("@repo//foo/bar:baz").relative("//visibility:public") == Label("//visibility:public")
Label("@repo//foo/bar:baz").relative("@other//wiz:quux") == Label("@other//wiz:quux")
```

If the repository mapping passed in is `{'@other' : '@remapped'}`, then the following remapping will take place:

```
Label("@repo//foo/bar:baz").relative("@other//wiz:quux") == Label("@remapped//wiz:quux")
```

### Parameters

| Parameter | Description |
| --- | --- |
| `relName` | [string](../core/string); required |

## repo\_name

```
string Label.repo_name
```

The canonical name of the repository containing the target referred to by this label, without any leading at-signs (`@`). For instance,

```
Label("@@foo//bar:baz").repo_name == "foo"
```

## same\_package\_label

```
Label Label.same_package_label(target_name)
```

Creates a label in the same package as this label with the given target name.

### Parameters

| Parameter | Description |
| --- | --- |
| `target_name` | [string](../core/string); required |

## workspace\_name

```
string Label.workspace_name
```

**Experimental**. This API is experimental and may change at any time. Please do not depend on it. It may be enabled on an experimental basis by setting `--+incompatible_enable_deprecated_label_apis`
**Deprecated.** The field name "workspace name" is a misnomer here; use the identically-behaving [`Label.repo_name`](#repo_name) instead.

The canonical name of the repository containing the target referred to by this label, without any leading at-signs (`@`). For instance,

```
Label("@@foo//bar:baz").workspace_name == "foo"
```

## workspace\_root

```
string Label.workspace_root
```

Returns the execution root for the repository containing the target referred to by this label, relative to the execroot. For instance:

```
Label("@repo//pkg/foo:abc").workspace_root == "external/repo"
```